线条属性对文本感知清晰度的影响模型研究

Study on a Correlation Model for Text Perceptual Distinctness

对数字硬拷贝成像ISO13660标准的线条客观属性量与其形成文本的感知清晰度的相关性进行了研究。实验针对6.5磅和10.5磅简单笔划的黑体汉字、Times New Roman西文字符,以及等价宽度的线条组成的等宽度明暗条纹,进行了清晰度感知质量的主观测评和相应单线条客观质量属性的测量,并建立了两者间的相关模型。结果表明,线条的对比度、粗糙度、相对模糊度及线宽与文字的感知清晰度具有线性相关性,且感知清晰度与线条的对比度正相关,与粗糙度和相对模糊度负相关;对少笔划或多笔划但间距较大的情况,感知清晰度与线宽正相关,反之,负相关。此外,各线属性量对感知清晰度的影响权重相互间至少有1倍的差距。

The effect of line attributes, defined by IS013660 standard for digital hardcopy imaging, on text perceptual distinctness is investigated. For lines with equivalent widths and strokes of Black Type Chinese charatescs and Times New Roman English letters with 6. 5 points and 10. 5 points, the line attribute parameters of their hardcopy prints are measured. And evaluations of the psychophysical distinctness on the text with a little strokes and line stripe, are carried out. Then a linear correlation model is built up between them. Experimental results indicate that the text perceptual distinctness can be linearly related to line＇s contrast, raggedness, relative blurriness and line width, and always positively related to the contrast and negatively related to the raggedness and the relative blurriness. Whereas, in the case of simple strokes or strokes with large distance, there is a positive correlation between the text perceptual distinctness and line width, otherwise, negative correlation. Additionally, there is at least 1 time difference in the influence weight of each line attribute on the text perceptual distinctness.